To display the error code on the user interface ............................................................................................................

1.2

To reset the error code via remote controller ...............................................................................................................

1.3

To reset the error code via outdoor unit .......................................................................................................................

1.4

To perform a test run......................................................................................................................................................

1.4.1

To perform a test run using the user interface .............................................................................................

1.5

Error based troubleshooting...........................................................................................................................................

1.5.1

A1-00 - PCB abnormality ...............................................................................................................................

1.5.2

A5-00 - Freeze-up protection / heating peak cut control.............................................................................

1.5.3

A6-00 - Indoor unit fan motor abnormality ..................................................................................................

1.5.4

AH-00 - Streamer unit abnormality............................................................................................................... 10

1.5.5

C4-00 - Indoor heat exchanger thermistor abnormality .............................................................................. 10

1.5.6

C9-00 - Room thermistor abnormality .......................................................................................................... 11

1.5.7

CC-00 - Humidity sensor abnormality ........................................................................................................... 11

1.5.8

CE-00 - Intelligent thermal sensor abnormality............................................................................................ 11

1.5.9

E1-00 - Outdoor unit: PCB defect.................................................................................................................. 12

1.5.10

E3-00 - Outdoor unit: Actuation of high pressure switch............................................................................. 13

1.5.11

E5-00 - Outdoor unit: Overheat of inverter compressor motor................................................................... 14

1.5.12

E6-00 - Outdoor unit: Compressor startup defect........................................................................................ 15

1.5.13

E7-00 - Outdoor unit: Malfunction of outdoor unit fan motor .................................................................... 16

1.5.14

E8-00 - Outdoor unit: Power input overvoltage ........................................................................................... 16

1.5.15

EA-00 - Cooling/Heating switch abnormality ................................................................................................ 17

1.5.16

F3-00 - Outdoor unit: Malfunction of discharge pipe temperature............................................................. 18

1.5.17

F6-00 - Outdoor unit: Abnormal high pressure in cooling............................................................................ 18

1.5.18

F8-00 - System shutdown due to compressor internal temperature abnormality...................................... 19

1.5.19

H0-00 - Outdoor unit: Voltage/current sensor problem .............................................................................. 20

1.5.20

H3-00 - Outdoor unit: Malfunction of high pressure switch ........................................................................ 20

1.5.21

H6-00 - Outdoor unit: Malfunction of position detection sensor ................................................................ 21

1.5.22

H8-00 - Outdoor unit: Malfunction of compressor input system................................................................. 22

1.5.23

H9-00 - Outdoor unit: Malfunction of outdoor air thermistor ..................................................................... 23

1.5.24

J3-00 - Outdoor unit: Malfunction of discharge pipe thermistor................................................................. 23

1.5.25

J6-00 - Outdoor unit: Malfunction of heat exchanger thermistor ............................................................... 23

1.5.26

L3-00 - Outdoor unit: Electrical box temperature rise problem................................................................... 24

1.5.27

L4-00 - Outdoor unit: Malfunction of inverter radiating fin temperature rise ............................................ 25

1.5.28

L5-00 - Outdoor unit: Inverter instantaneous overcurrent .......................................................................... 25

1.5.29

P4-00 - Outdoor unit: Malfunction of radiating fin temperature sensor ..................................................... 26

1.5.30

U0-00 - Outdoor unit: Shortage of refrigerant ............................................................................................. 27

1.5.31

U2-00 - Outdoor unit: Defect of power supply voltage ................................................................................ 27

1.5.32

U4-00 - Indoor/outdoor unit communication problem................................................................................ 28

1.5.33

U5-00 - Transmission malfunction between indoor unit and remote controller ........................................ 29

1.5.34

UA-00 - Indoor unit, outdoor unit mismatching problem ............................................................................ 29

1.6

Symptom based troubleshooting ................................................................................................................................... 31

1.6.1

Operation does not start................................................................................................................................ 31

1.6.2

Operation sometimes stops ........................................................................................................................... 31

1.6.3

Operation starts but the unit does not cool/heat ......................................................................................... 32

1.6.4

Operating noise and vibrations ...................................................................................................................... 33

1.6.5

Abnormal high pressure ................................................................................................................................. 34

1.6.6

Abnormal low pressure .................................................................................................................................. 35

1.6.7

Indoor fan starts operating but the compressor does not operate.............................................................. 36

1.6.8

Operation starts and the unit stops immediately.......................................................................................... 37

1.6.9

Operation stops, unit cannot start for a while .............................................................................................. 37

1.6.10

Unit discharges white mist ............................................................................................................................. 38

1.6.11

Humidifying problem...................................................................................................................................... 38

1.6.12

Swing flap does not operate .......................................................................................................................... 38

2 Components

2.1

4-way valve...................................................................................................................................................................... 39

2.1.1

Checking procedures ...................................................................................................................................... 39

2.1.2

Repair procedures .......................................................................................................................................... 42

2.2

Compressor ..................................................................................................................................................................... 45

2.2.1

Checking procedures ...................................................................................................................................... 45

2.2.2

Repair procedures .......................................................................................................................................... 50

2.3

Expansion valve............................................................................................................................................................... 54

2.3.1

Checking procedures ...................................................................................................................................... 54

2.3.2

Repair procedures .......................................................................................................................................... 56

(C)(F)TXA15~50A(W)(S)(T) + (C)(F)TXA15~50B(B)(S)(T) + RXA42+50A +